Year	million ton-km
1995	8568
1996	6779
1997	7445
1998	7701
1999	7337
2000	7588
2001	6437
2002	6437
2004	8670
2006	10441
2007	10973
2008	11547
2009	11765
2010	11765
2011	11992
2012	11992
2014	11992
2015	13327
2016	13327
2017	13327